DOI: https://doi.org/10.32515/2414-3820.2021.51.54-60

Laser-plasma Strengthening of Pre-heat-treated Road Transport Details in the Agro-industrial Complex

Yuriy Kovalchuk, Ivan Lisovyi

About the Authors

Yuriy Kovalchuk, Associate Professor, PhD in Technics (Candidate of Technics Sciences), Uman National University of Horticulture, Uman, Ukraine, e–mail: temp14053@gmail.com

Ivan Lisovyi, Associate Professor, PhD in Technics (Candidate of Technics Sciences), Uman National University of Horticulture, Uman, Ukraine, e–mail: lisov.iv.ol@gmail.com, ORCID ID: 0000-0003-1480-1805

Abstract

The aim of the work is to determine the laser-plasma effect on the structure and microhardness of surfaces of ordinary and after heat treatment by hardening with low and high tempering steel 40HN with different structure, to study the possibility of laser-plasma treatment to strengthen the surface at different stages of manufacturing or repair transport details in the agro-industrial complex. The article presents the results of laser-plasma exposure to the structure and microhardness of surfaces of ordinary and after heat treatment by hardening with low and high tempering steel 40HN with different structure: normalized or annealed steel immediately after machining, and after volumetric heat treatment with different types tempering for different hardness, determined by the purpose of the workpieces. First, the features of the microstructure and hardness of steel with a ferritic-pearlitic structure during laser-plasma treatment were studied. The highest temperature, which causes melting and evaporation of the material, during laser treatment occurs on the surface of the processed products. During further cooling due to intensive heat dissipation into the cold core of the metal in the melting zone is hardening from the liquid state and the formation of martensite. Adjacent to these areas is the zone of martensite obtained by quenching during cooling from the solid austenitic state. Then the influence of laser-plasma treatment on the features of the microstructure and hardness of steel with the structure of tempering sorbitol and with the structure of martensite was considered. Laser-plasma treatment can be used with high efficiency to strengthen structural steels. It allows to strengthen the surface of structural steel to a high hardness of 9-11 GPa to a depth of about 0.2 mm. The hardening effect is obtained on steels with different structure, characteristic for different stages of the techno¬logical process. Therefore, the use of laser-plasma treatment to strengthen the surface is possible at different stages of the technological process of manufacturing or repairing parts of road transport in agriculture.

Keywords

laser plasma, optical pulsating discharge, hardening, microhardness, road transport details in the agro-industrial complex

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References

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